/*
 * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package me.ahoo.wow.cosec.propagation

import me.ahoo.wow.api.messaging.Header
import me.ahoo.wow.api.messaging.Message
import me.ahoo.wow.messaging.propagation.MessagePropagator

class CoSecMessagePropagator : MessagePropagator {
    companion object {
        const val APP_ID = "app_id"
        const val DEVICE_ID = "device_id"
        val Header.appId: String?
            get() = this[APP_ID]

        fun Header.withAppId(appId: String): Header {
            return this.with(APP_ID, appId)
        }

        val Header.deviceId: String?
            get() = this[DEVICE_ID]

        fun Header.withDeviceId(deviceId: String): Header {
            return this.with(DEVICE_ID, deviceId)
        }
    }

    override fun propagate(header: Header, upstream: Message<*, *>) {
        upstream.header.appId?.let {
            header.withAppId(it)
        }
        upstream.header.deviceId?.let {
            header.withDeviceId(it)
        }
    }
}
